--- template.orig	2020-10-27 00:24:28.904889000 +0600
+++ template	2020-10-27 22:07:16.418607000 +0600
@@ -16,2 +16,8 @@ checksum=acd735c9d46bf86ee14337c71c56f74
 
+post_patch() {
+	# remove nonfree artwork and sound effects
+	rm -v lib/sounds/*.mp3
+	rm -v lib/tiles/shockbolt/64x64.png
+}
+
 pre_configure() {
